Journal
CHEMICAL COMMUNICATIONS
Volume 56, Issue 98, Pages 15466-15469Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0cc06840c
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Funding
- National Science Foundation [CHE-1900406]
- Welch Foundation [A-1658]
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A series of bidentate N-heterocyclic carbene (NHC) iridium catalysts, [Ir(kappa C,N-NHC)H2L2]BPh4, are proposed for SABRE hyperpolarization. The steric and electronic properties of the NHCs are used to tune substrate affinity and thereby SABRE efficiency. The sterically hindered substrates 2,4-diaminopyrimidine and trimethoprim yielded maximum proton NMR signal enhancements of similar to 300-fold and similar to 150-fold, respectively.
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